Among the transition metals of 3d series, the one that has highest negative (M2+M/) standard electrode potential isTiCuMnZn

The transition metal of the 3d series that has the highest negative standard electrode potential (M2+/M) is Mn.

Here's a step-by-step explanation:

1. Standard electrode potential is a measure of the tendency of a chemical species to acquire electrons and thereby be reduced. A higher negative value indicates a greater tendency to lose electrons and be oxidized.

2. The standard electrode potentials (E°) for the M2+/M couple for the first row transition metals are as follows:

   • Ti2+/Ti = -1.63 V
   • Cu2+/Cu = +0.34 V
   • Mn2+/Mn = -1.18 V
   • Zn2+/Zn = -0.76 V

3. From these values, it can be seen that Ti has the highest negative standard electrode potential, not Mn.

So, the correct answer should be Ti.